CN113815080B - Thermal-modification deformation-resistant household door plate and production process thereof - Google Patents
Thermal-modification deformation-resistant household door plate and production process thereof Download PDFInfo
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- B—PERFORMING OPERATIONS; TRANSPORTING
- B27—WORKING OR PRESERVING WOOD OR SIMILAR MATERIAL; NAILING OR STAPLING MACHINES IN GENERAL
- B27M—WORKING OF WOOD NOT PROVIDED FOR IN SUBCLASSES B27B - B27L; MANUFACTURE OF SPECIFIC WOODEN ARTICLES
- B27M3/00—Manufacture or reconditioning of specific semi-finished or finished articles
- B27M3/18—Manufacture or reconditioning of specific semi-finished or finished articles of furniture or of doors
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- B—PERFORMING OPERATIONS; TRANSPORTING
- B27—WORKING OR PRESERVING WOOD OR SIMILAR MATERIAL; NAILING OR STAPLING MACHINES IN GENERAL
- B27D—WORKING VENEER OR PLYWOOD
- B27D1/00—Joining wood veneer with any material; Forming articles thereby; Preparatory processing of surfaces to be joined, e.g. scoring
- B27D1/04—Joining wood veneer with any material; Forming articles thereby; Preparatory processing of surfaces to be joined, e.g. scoring to produce plywood or articles made therefrom; Plywood sheets
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- B—PERFORMING OPERATIONS; TRANSPORTING
- B27—WORKING OR PRESERVING WOOD OR SIMILAR MATERIAL; NAILING OR STAPLING MACHINES IN GENERAL
- B27D—WORKING VENEER OR PLYWOOD
- B27D1/00—Joining wood veneer with any material; Forming articles thereby; Preparatory processing of surfaces to be joined, e.g. scoring
- B27D1/04—Joining wood veneer with any material; Forming articles thereby; Preparatory processing of surfaces to be joined, e.g. scoring to produce plywood or articles made therefrom; Plywood sheets
- B27D1/06—Manufacture of central layers; Form of central layers
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- B—PERFORMING OPERATIONS; TRANSPORTING
- B27—WORKING OR PRESERVING WOOD OR SIMILAR MATERIAL; NAILING OR STAPLING MACHINES IN GENERAL
- B27D—WORKING VENEER OR PLYWOOD
- B27D1/00—Joining wood veneer with any material; Forming articles thereby; Preparatory processing of surfaces to be joined, e.g. scoring
- B27D1/04—Joining wood veneer with any material; Forming articles thereby; Preparatory processing of surfaces to be joined, e.g. scoring to produce plywood or articles made therefrom; Plywood sheets
- B27D1/08—Manufacture of shaped articles; Presses specially designed therefor
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- B—PERFORMING OPERATIONS; TRANSPORTING
- B27—WORKING OR PRESERVING WOOD OR SIMILAR MATERIAL; NAILING OR STAPLING MACHINES IN GENERAL
- B27M—WORKING OF WOOD NOT PROVIDED FOR IN SUBCLASSES B27B - B27L; MANUFACTURE OF SPECIFIC WOODEN ARTICLES
- B27M1/00—Working of wood not provided for in subclasses B27B - B27L, e.g. by stretching
- B27M1/06—Working of wood not provided for in subclasses B27B - B27L, e.g. by stretching by burning or charring, e.g. cutting with hot wire
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- B—PERFORMING OPERATIONS; TRANSPORTING
- B27—WORKING OR PRESERVING WOOD OR SIMILAR MATERIAL; NAILING OR STAPLING MACHINES IN GENERAL
- B27M—WORKING OF WOOD NOT PROVIDED FOR IN SUBCLASSES B27B - B27L; MANUFACTURE OF SPECIFIC WOODEN ARTICLES
- B27M1/00—Working of wood not provided for in subclasses B27B - B27L, e.g. by stretching
- B27M1/08—Working of wood not provided for in subclasses B27B - B27L, e.g. by stretching by multi-step processes
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- B—PERFORMING OPERATIONS; TRANSPORTING
- B32—LAYERED PRODUCTS
- B32B—LAYERED PRODUCTS, i.e. PRODUCTS BUILT-UP OF STRATA OF FLAT OR NON-FLAT, e.g. CELLULAR OR HONEYCOMB, FORM
- B32B21/00—Layered products comprising a layer of wood, e.g. wood board, veneer, wood particle board
- B32B21/02—Layered products comprising a layer of wood, e.g. wood board, veneer, wood particle board the layer being formed of fibres, chips, or particles, e.g. MDF, HDF, OSB, chipboard, particle board, hardboard
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- B—PERFORMING OPERATIONS; TRANSPORTING
- B32—LAYERED PRODUCTS
- B32B—LAYERED PRODUCTS, i.e. PRODUCTS BUILT-UP OF STRATA OF FLAT OR NON-FLAT, e.g. CELLULAR OR HONEYCOMB, FORM
- B32B21/00—Layered products comprising a layer of wood, e.g. wood board, veneer, wood particle board
- B32B21/04—Layered products comprising a layer of wood, e.g. wood board, veneer, wood particle board comprising wood as the main or only constituent of a layer, which is next to another layer of the same or of a different material
- B32B21/042—Layered products comprising a layer of wood, e.g. wood board, veneer, wood particle board comprising wood as the main or only constituent of a layer, which is next to another layer of the same or of a different material of wood
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- B—PERFORMING OPERATIONS; TRANSPORTING
- B32—LAYERED PRODUCTS
- B32B—LAYERED PRODUCTS, i.e. PRODUCTS BUILT-UP OF STRATA OF FLAT OR NON-FLAT, e.g. CELLULAR OR HONEYCOMB, FORM
- B32B21/00—Layered products comprising a layer of wood, e.g. wood board, veneer, wood particle board
- B32B21/04—Layered products comprising a layer of wood, e.g. wood board, veneer, wood particle board comprising wood as the main or only constituent of a layer, which is next to another layer of the same or of a different material
- B32B21/06—Layered products comprising a layer of wood, e.g. wood board, veneer, wood particle board comprising wood as the main or only constituent of a layer, which is next to another layer of the same or of a different material of paper or cardboard
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- B—PERFORMING OPERATIONS; TRANSPORTING
- B32—LAYERED PRODUCTS
- B32B—LAYERED PRODUCTS, i.e. PRODUCTS BUILT-UP OF STRATA OF FLAT OR NON-FLAT, e.g. CELLULAR OR HONEYCOMB, FORM
- B32B21/00—Layered products comprising a layer of wood, e.g. wood board, veneer, wood particle board
- B32B21/14—Layered products comprising a layer of wood, e.g. wood board, veneer, wood particle board comprising wood board or veneer
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- B—PERFORMING OPERATIONS; TRANSPORTING
- B32—LAYERED PRODUCTS
- B32B—LAYERED PRODUCTS, i.e. PRODUCTS BUILT-UP OF STRATA OF FLAT OR NON-FLAT, e.g. CELLULAR OR HONEYCOMB, FORM
- B32B29/00—Layered products comprising a layer of paper or cardboard
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- B—PERFORMING OPERATIONS; TRANSPORTING
- B32—LAYERED PRODUCTS
- B32B—LAYERED PRODUCTS, i.e. PRODUCTS BUILT-UP OF STRATA OF FLAT OR NON-FLAT, e.g. CELLULAR OR HONEYCOMB, FORM
- B32B37/00—Methods or apparatus for laminating, e.g. by curing or by ultrasonic bonding
- B32B37/06—Methods or apparatus for laminating, e.g. by curing or by ultrasonic bonding characterised by the heating method
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- B—PERFORMING OPERATIONS; TRANSPORTING
- B32—LAYERED PRODUCTS
- B32B—LAYERED PRODUCTS, i.e. PRODUCTS BUILT-UP OF STRATA OF FLAT OR NON-FLAT, e.g. CELLULAR OR HONEYCOMB, FORM
- B32B37/00—Methods or apparatus for laminating, e.g. by curing or by ultrasonic bonding
- B32B37/08—Methods or apparatus for laminating, e.g. by curing or by ultrasonic bonding characterised by the cooling method
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- B—PERFORMING OPERATIONS; TRANSPORTING
- B32—LAYERED PRODUCTS
- B32B—LAYERED PRODUCTS, i.e. PRODUCTS BUILT-UP OF STRATA OF FLAT OR NON-FLAT, e.g. CELLULAR OR HONEYCOMB, FORM
- B32B37/00—Methods or apparatus for laminating, e.g. by curing or by ultrasonic bonding
- B32B37/10—Methods or apparatus for laminating, e.g. by curing or by ultrasonic bonding characterised by the pressing technique, e.g. using action of vacuum or fluid pressure
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- B—PERFORMING OPERATIONS; TRANSPORTING
- B32—LAYERED PRODUCTS
- B32B—LAYERED PRODUCTS, i.e. PRODUCTS BUILT-UP OF STRATA OF FLAT OR NON-FLAT, e.g. CELLULAR OR HONEYCOMB, FORM
- B32B37/00—Methods or apparatus for laminating, e.g. by curing or by ultrasonic bonding
- B32B37/12—Methods or apparatus for laminating, e.g. by curing or by ultrasonic bonding characterised by using adhesives
- B32B37/1284—Application of adhesive
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- B—PERFORMING OPERATIONS; TRANSPORTING
- B32—LAYERED PRODUCTS
- B32B—LAYERED PRODUCTS, i.e. PRODUCTS BUILT-UP OF STRATA OF FLAT OR NON-FLAT, e.g. CELLULAR OR HONEYCOMB, FORM
- B32B38/00—Ancillary operations in connection with laminating processes
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- B—PERFORMING OPERATIONS; TRANSPORTING
- B32—LAYERED PRODUCTS
- B32B—LAYERED PRODUCTS, i.e. PRODUCTS BUILT-UP OF STRATA OF FLAT OR NON-FLAT, e.g. CELLULAR OR HONEYCOMB, FORM
- B32B38/00—Ancillary operations in connection with laminating processes
- B32B38/0004—Cutting, tearing or severing, e.g. bursting; Cutter details
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- B—PERFORMING OPERATIONS; TRANSPORTING
- B32—LAYERED PRODUCTS
- B32B—LAYERED PRODUCTS, i.e. PRODUCTS BUILT-UP OF STRATA OF FLAT OR NON-FLAT, e.g. CELLULAR OR HONEYCOMB, FORM
- B32B2479/00—Furniture
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Abstract
The invention provides a production process of a thermal-modification anti-deformation household door plate, which structurally comprises a core plate layer, a middle plate layer, a balance layer and a facing layer group; the production process of the thermal-modified anti-deformation household door plate comprises the steps of treating a core lath and a middle plate which are manufactured by using an MJB-TF wood stabilizer, and putting the core lath and the middle plate into a microwave drying kiln for dehydration and carbonization; by using the wood stabilizer, the original physical structure (namely internal stress) of the wood is destroyed, the fiber toughness of the wood is increased, the parallel extension tension of the wood fiber of the wood is improved, the stability of the wood is kept, and the brittleness of the wood caused by carbonization is reduced; the steam dampening procedure is added in the microwave high-frequency carbonization treatment process, so that the carbonization degree of each part of the plate is more uniform, the dimensional stability is effectively improved, and the stability of each mechanical property of the plate is kept.
Description
Technical Field
The invention belongs to the field of plate production and manufacturing, and particularly relates to a thermal-modification deformation-resistant household door plate.
Background
With the development of times, the home customization industry is updated, but most of the existing large-scale customized home boards are density boards or particle boards, and the density boards and the particle boards are low in grade compared with solid wood boards, so that the requirements of consumers on solid wood customized products cannot be met.
Because of different wood types, wood has different fibers, densities and strengths, and after home decoration, the problems of shrinkage, warping and the like often occur along with the change of environment. Over the years, studies have been made to improve the properties of wood, such as dimensional stability and heat resistance, and great progress has been made, and particularly in recent years, carbonized wood products have been favored. For example, CN201610424557.7, "a prestressed carbonized wood board with creep deformation resistance and a method for preparing the same", is a method for perforating a core board to reduce creep deformation, but the method cannot be embodied in actual production operation, and is difficult in production operation and complicated in steps. For example, CN201910678670.1, which is a method for preparing reinforced and flame-retardant carbonized rubber wood sheets, carbonized wood beams have poor carbonization effect and incomplete carbonization. At present, the carbonization technology is mainly applied to solid wood floor products, but the carbonization technology is rarely applied to solid wood ecological plates, and the main reasons are as follows: 1. the traditional carbonization technology is carried out by heating with steam, so that wood cannot be uniformly heated, and the processing cost is too high; 2. most of the solid wood ecological board core materials are low-density materials, and the traditional carbonization effect is poor; 3. the carbonized plate is brittle and is not easy to process.
Disclosure of Invention
Aiming at the technical problems, the invention provides a production process of a thermal-modification anti-deformation household door sheet, the structure of the household door sheet consists of a core plate layer, a middle plate layer, a balance layer and a veneer layer, and the production process of the thermal-modification anti-deformation household door sheet comprises the following steps:
1) sawing a core plate strip with the length of 25 +/-1 cm, the width of 6 +/-1 cm and the height of 1.2 +/-0.1 cm from the raw material; rotary cutting a log into a middle plate with the length of 127 +/-1 mm, the width of 63 +/-1 mm and the thickness of 2.6-3.0 mm;
2) treating the core lath and the middle plate manufactured in the step 1) by using MJB-TF wood stabilizer;
3) placing the core board strips and the middle board treated in the step 2) into a microwave drying kiln for dehydration and carbonization: a) carrying out medium-temperature hemicellulose dehydration at 150 ℃, wherein the power is 250 w: b) controlling the temperature of the microwave drying kiln at 150 ℃ and maintaining for 30min, and keeping the microwave power at 1 kw; then, carrying out steam moisture regain until the water content is 15%, then keeping the temperature at 150 ℃ for carbonization for 3min, and repeating the steps for 2 times, wherein the microwave power is 150 w; c) finally, gradient cooling is carried out at the speed of 2 ℃/h, and after cooling, curing is carried out for 7 days to obtain the medium-temperature heat-treated wood with the water content of 4-6%;
4) assembling the core plate strips subjected to the medium-temperature heat treatment in the step 3) with soybean glue, pressing the core plate strips into core plate layers of 2500mm x 1240mm by using a side press, and controlling the water content of the core plate layers to be 6-8%;
5) assembling the core plate prepared in the step 4) by using the soybean glue, wherein the middle plate subjected to the medium temperature heat treatment in the step 3) is subjected to cold pressing, the unit pressure is 0.7 +/-0.2 MPa, and the time is 0.5-1 h. And hot pressing at the unit pressure of 0.6 +/-0.2 MPa and the temperature of 125 +/-5 ℃ for 18min after cold pressing is finished to obtain a primary semi-finished product.
6) Scraping the putty on the primary semi-finished product prepared in the step 5) and preserving health.
7) And (3) gluing the primary semi-finished product obtained in the step 6), assembling the second layer of the middle plate obtained in the step 3) through medium-temperature heat treatment, and cold pressing at the unit pressure of 0.7 +/-0.2 MPa for 0.5-1 h. Hot pressing at unit pressure of 0.6 + -0.2 MPa and temperature of 125 + -5 deg.C for 18min to obtain secondary semi-finished product;
8) and (6) pressing and pasting the facing.
In some embodiments, the veneer pressing process in step 8) is a direct veneer pressing process, which specifically includes the following steps: and (3) cold pressing the veneer layer of the secondary semi-finished product cloth and glue assembly density board prepared in the step 7), wherein the unit pressure is 0.65 +/-0.2 MPa, and the time is 0.5-1 h. Hot pressing is carried out after cold pressing is finished, the unit pressure is 0.6 +/-0.2 MPa, the temperature is 125 +/-5 ℃, and the time is 360 seconds; the melamine impregnated bond paper is adopted for facing and pressing, the unit pressure is 0.7 +/-0.2 MPa, the temperature is 130 +/-8 ℃, and the time is 390 +/-60 s.
In some embodiments, the veneer pressing process in step 8) is a composite veneer pressing process, which specifically includes the following steps: and (3) pressing and pasting the density board veneer layer and the melamine impregnated bond paper into a combined veneer layer, wherein the unit pressure is 1.8 +/-0.2 MPa, the temperature is 200 ℃, and the time is 30 +/-5 s. And (5) compounding and pressing the semi-finished substrate produced in the step (7) and the combined decorative surface layer produced in the step (8) for 800 +/-60 s at the temperature of 85 +/-5 ℃ and the unit pressure of 0.5 +/-0.2 MPa.
In some embodiments, the core layer is made of fir or pine, and the thickness of the core layer is 1.2-1.3 cm; the middle plate layer is made of eucalyptus and poplar, and the thickness of the middle plate layer is 2.6-3.0 mm.
In some embodiments, the balance layer is a technical wood veneer, a density board or a poplar veneer, and the thickness of the balance layer is 0.7-1.0 mm.
In some embodiments, the finish layer is preferably selected from melamine impregnated bond paper, PP film finish, or UV finish.
In some embodiments, the foregoing wood stabilizer MJB-TF was purchased from spearmint chemicals, inc.
The invention obtains the thermal modified anti-deformation household door plate according to the production process.
The invention has the following beneficial effects:
1. the invention destroys the original physical structure (i.e. internal stress) of the wood by using the wood stabilizer, increases the fiber toughness, improves the parallel extension tension of the wood fiber, keeps the wood stable, and reduces the brittleness of the wood caused by carbonization.
2. According to the invention, a steam dampening procedure is added in the microwave high-frequency carbonization treatment process, so that the carbonization degree of each part of the plate is more uniform, the dimensional stability is effectively improved, and various mechanical properties of the plate are kept stable.
3. The raw material carbonization process is optimized, and the high-frequency microwave technology is adopted to ensure that water molecules move violently and accelerate the carbonization rate in the plate.
4. According to the characteristics of the carbonized raw materials, the preparation process of the ecological plate is optimized, and the two middle plate layers are used, so that the static bending strength of the ecological plate is improved by over 50 percent.
Drawings
FIG. 1 is a schematic structural diagram of a household door panel provided by the present invention;
wherein, 1-veneer layer, 2-balance layer, 3-middle plate layer, 4-middle plate layer and 5-core plate layer.
Detailed Description
In order to more clearly show the objects and technical advantages of the present invention, the technical solution of the present invention will be described in detail below. It is to be understood that the described embodiments are only a few embodiments of the invention, and not all embodiments. Based on the embodiments in the present disclosure, those skilled in the art can obtain the embodiments without any inventive work, and the embodiments belong to the protection scope of the present invention.
Example 1
A production process of a thermal-modification deformation-resistant household door plate comprises the following implementation steps:
1) sawing a fir wood into a core board strip with the length of 25cm, the width of 6cm and the height of 1.2 cm; rotary cutting eucalyptus into a middle plate with the thickness of 127mm × 63mm and a middle plate with the thickness of 2.6 mm;
2) using MJB-TF wood stabilizer to treat the core lath and the middle plate;
3) placing the core board strip and the middle board treated by the stabilizing agent in the step 2) into a microwave drying kiln, and dehydrating the medium-temperature hemicellulose at 150 ℃, wherein the power is 250 w: maintaining the microwave drying kiln at the temperature of 150 ℃ for 30min, and keeping the microwave power at 1 kw; then, carrying out steam moisture regain until the water content is 15%, then keeping the temperature at 150 ℃ for carbonization for 3min, and repeating the steps for 2 times, wherein the microwave power is 150 w; finally, gradient cooling is carried out at the speed of 2 ℃/h, and the wood is subjected to medium temperature heat treatment after being cooled and maintained for 7 days;
4) then, assembling a core plate strip by using soybean glue, pressing the core plate strip into a core plate layer with the thickness of 2500mm x 1240mm by using a side press, and controlling the water content of the core plate layer to be 6%;
5) and (3) gluing and assembling the core plate and the middle plate subjected to microwave carbonization, and cold pressing at the unit pressure of 0.7MPa for 1 h. After the cold pressing is finished, performing a hot pressing process, wherein the unit pressure is 0.6MPa, the temperature is 125 ℃, and the time is 18 min;
6) scraping greasiness on the semi-finished product prepared in the step 5) and preserving health for 20 days;
7) and (3) gluing the semi-finished product obtained in the step 6), assembling a second layer of middle plate, and cold pressing at a unit pressure of 0.7MPa for 1 h. After the cold pressing is finished, performing a hot pressing process, wherein the unit pressure is 0.6MPa, the temperature is 125 ℃, and the time is 18 min;
8) cold pressing the semi-finished product cloth and glue assembly density board veneer layer prepared in the step 7) at a unit pressure of 0.65MPa for 1 h; after the cold pressing is finished, performing a hot pressing process, wherein the unit pressure is 0.6MPa, the temperature is 125 ℃, and the time is 360 s;
9) and (3) adopting melamine impregnated bond paper to carry out facing and pressing, wherein the unit pressure is 0.7MPa, the temperature is 130 ℃, and the time is 390 s.
Example 2
A production process of a thermal-modification deformation-resistant household door plate comprises the following implementation steps:
1) sawing a fir wood into a core board strip with the length of 25cm, the width of 6cm and the height of 1.2 cm; rotary cutting eucalyptus into a middle plate with thickness of 127mm × 63mm, and the thickness is 2.6 mm;
2) treating the core board and the middle board by using MJB-TF wood stabilizer;
3) placing the core board strip and the middle board treated by the stabilizing agent in the step 2) into a microwave drying kiln, and dehydrating the medium-temperature hemicellulose at 150 ℃, wherein the power is 250 w: heating the microwave drying kiln to 150 ℃ and maintaining for 30min, and keeping the microwave power at 1 kw; then, carrying out steam moisture regain until the water content is 15%, then keeping the temperature at 150 ℃ for carbonization for 3min, and repeating the steps for 2 times, wherein the microwave power is 150 w; finally, gradient cooling is carried out at the speed of 2 ℃/h, and the wood is subjected to medium temperature heat treatment after being cooled and maintained for 7 days;
4) assembling a core plate strip by using soybean glue, pressing the core plate strip into a core plate layer with the thickness of 2500mm multiplied by 1240mm by using a side press, and controlling the water content of the core plate layer to be 6%;
5) distributing glue on the core plate and the middle plate subjected to microwave carbonization to assemble a blank, and performing cold pressing, wherein the unit pressure is 0.7MPa, and the time is 1 h; after the cold pressing is finished, performing a hot pressing process, wherein the unit pressure is 0.6MPa, the temperature is 125 ℃, and the time is 18 min;
6) scraping greasiness on the semi-finished product prepared in the step 5) and preserving health for 20 days;
7) glue spreading is carried out on the semi-finished product which is well cured in the step 6), then a middle plate in the second layer is assembled, cold pressing is carried out, the unit pressure is 0.7MPa, and the time is 1 h; after the cold pressing is finished, performing a hot pressing process, wherein the unit pressure is 0.6MPa, the temperature is 125 ℃, and the time is 18 min;
8) pressing and pasting the density board veneer layer and the melamine impregnated bond paper into a combined veneer layer, wherein the unit pressure is 1.8MPa, the temperature is 200 ℃, and the time is 30 s;
9) and (3) compounding and pressing the semi-finished product substrate produced in the step 7) and the combined decorative surface layer produced in the step 8) for 800s at the unit pressure of 1.8MPa and the temperature of 85 ℃.
Comparative example 1
A production process of a household door plate comprises the following implementation steps:
1) sawing a fir wood into a core board strip with the length of 25cm, the width of 6cm and the height of 1.2 cm; rotary cutting eucalyptus into a middle plate with thickness of 127mm × 63mm, and the thickness is 2.6 mm;
2) putting the core board strip and the middle board into a microwave drying kiln, and dehydrating the hemicellulose at the medium temperature of 150 ℃, wherein the power is 250 w: heating the microwave drying kiln to 150 ℃ and maintaining for 30min, and keeping the microwave power at 1 kw; then, carrying out steam moisture regain until the water content is 15%, then keeping the temperature at 150 ℃ for carbonization for 3min, and repeating the steps for 2 times, wherein the microwave power is 150 w; finally, gradient cooling is carried out at the speed of 2 ℃/h, and the wood is subjected to medium-temperature heat treatment after being cooled and maintained for 7 days;
3) then, the core board was assembled with soybean glue and pressed into a core board layer of 2500mm by 1240mm by a side press, and the water content was controlled to 6%.
4) And (3) gluing and assembling the core plate and the middle plate subjected to microwave carbonization, and cold pressing at the unit pressure of 0.7MPa for 1 h. After the cold pressing is finished, performing a hot pressing process, wherein the unit pressure is 0.6MPa, the temperature is 125 ℃, and the time is 18 min;
5) scraping the semi-finished product prepared in the step 4) to be greasy and preserving health for 20 days.
6) And (3) gluing the semi-finished product cured in the step 5), assembling the second layer of middle plate, and cold pressing at the unit pressure of 0.7MPa for 1 h. After the cold pressing is finished, performing a hot pressing process, wherein the unit pressure is 0.6MPa, the temperature is 125 ℃, and the time is 18 min;
7) and (3) carrying out cold pressing on the semi-finished cloth and glue assembly veneer layer prepared in the step 6), wherein the unit pressure is 0.65MPa, and the time is 1 h. And after the cold pressing is finished, performing a hot pressing process, wherein the unit pressure is 0.6MPa, the temperature is 125 ℃, and the time is 360 s.
8) And (3) adopting melamine impregnated bond paper to carry out facing and pressing, wherein the unit pressure is 0.7MPa, the temperature is 130 ℃, and the time is 390 s.
Comparative example 2
A production process of a household door plate comprises the following implementation steps:
step 1) sawing a fir wood into core board strips with the length of 25cm, the width of 6cm and the height of 1.2cm, then assembling the core board strips with soybean glue, pressing the core board strips into core boards with the thickness of 2500mm x 1240mm by using a side pressing machine, and controlling the water content of the core boards to be 10%;
step 2), rotationally cutting the eucalyptus into a middle plate with the thickness of 127 mm-63 mm, wherein the thickness is 2.6mm, and the water content is 18%;
step 3), performing glue distribution assembly on the core plate and the middle plate, and performing cold pressing, wherein the unit pressure is 0.7MPa, and the time is 1 h; after the cold pressing is finished, performing a hot pressing process, wherein the unit pressure is 0.6MPa, the temperature is 125 ℃, and the time is 18 min;
and 4) carrying out greasing operation on the semi-finished product prepared in the step 3) and preserving for 20 days.
Step 5) gluing the semi-finished product cured in the step 4), assembling a second layer of middle plate, and cold pressing at a unit pressure of 0.7MPa for 1 h; after the cold pressing is finished, performing a hot pressing process, wherein the unit pressure is 0.6MPa, the temperature is 125 ℃, and the time is 18 min;
and 6) carrying out cold pressing on the semi-finished cloth and glue assembly veneer layer prepared in the step 5), wherein the unit pressure is 0.65MPa, and the time is 1 h. After the cold pressing is finished, performing a hot pressing process, wherein the unit pressure is 0.6MPa, the temperature is 125 ℃, and the time is 360 s;
and 7) adopting melamine impregnated bond paper to perform facing and pressing, wherein the unit pressure is 0.7MPa, the temperature is 130 ℃, and the time is 390 s.
The examples and comparative examples were subjected to physical and chemical properties and appearance tests.
Detection standard: GB/T17657-2013, GB/T34722-2017
The thermal-modification anti-deformation household door sheet prepared by the manufacturing process has excellent mechanical properties through physical and chemical property and appearance detection, wherein the transverse static bending strength reaches over 35MPa, the elastic modulus reaches over 4500MPa, and the edge straightness is 0. Examples 1 and 2 fully illustrate that the core board and the middle board are carbonized after being treated by the MJB-TF wood stabilizer, and the deformation resistance of the ecological board is improved.
Comparative example 1 in comparison with examples 1 and 2, the lack of the stabilizer treatment step for the core plate and the middle plate correspondingly reduced the mechanical properties, specifically 29MPa for transverse static bending strength, 3600MPa for elastic modulus, and greatly reduced elastic modulus, which is mainly attributed to the fact that the middle plate and the core plate treated by the carbonization process become brittle and finally seriously affect the processing production.
Comparative example 4 in the absence of the stabilizer and the carbonization treatment step, the core sheet and the middle sheet were not carbonized, and the transverse static bending strength and the elastic modulus were unexpectedly and significantly reduced, compared to examples 1 and 2, indicating that the deformation resistance of the sheet was poor without the carbonization treatment.
The foregoing shows and describes the general principles, principal features, and advantages of the invention. It will be understood by those skilled in the art that the present invention is not limited to the embodiments described above, which are described in the specification and illustrated only to illustrate the principle of the present invention, but that various changes and modifications may be made therein without departing from the spirit and scope of the present invention, which fall within the scope of the invention as claimed. The scope of the invention is defined by the appended claims and equivalents thereof.
Claims (8)
1. A production process of a thermal-modification anti-deformation home door plate is characterized in that the home door plate structurally comprises a core plate layer, a middle plate layer, a balance layer and a finishing layer, and the production process of the thermal-modification anti-deformation home door plate comprises the following steps:
1) sawing a core plate strip with the length of 25 +/-1 cm, the width of 6 +/-1 cm and the height of 1.2 +/-0.1 cm from the raw material; rotary cutting a log into a middle plate with the length of 127 +/-1 mm, the width of 63 +/-1 mm and the thickness of 2.6-3.0 mm;
2) treating the core lath and the middle plate manufactured in the step 1) by using MJB-TF wood stabilizer;
3) placing the core board strip and the middle board treated in the step 2) into a microwave drying kiln for dehydration and carbonization: a) carrying out medium-temperature hemicellulose dehydration at 150 ℃, wherein the power is 250 w: b) controlling the temperature of the microwave drying kiln at 150 ℃ and maintaining for 30min, and keeping the microwave power at 1 kw; then, carrying out steam moisture regain until the water content is 15%, then keeping the temperature at 150 ℃ for carbonization for 3min, and repeating the steps for 2 times, wherein the microwave power is 150 w; c) finally, gradient cooling is carried out at the speed of 2 ℃/h, the wood is subjected to medium-temperature heat treatment after being cooled and maintained for 7 days, and the water content is 4-6%;
4) assembling the core plate strips subjected to the medium-temperature heat treatment in the step 3) with soybean glue, pressing the core plate strips into core plate layers of 2500mm x 1240mm by using a side press, and controlling the water content of the core plate layers to be 6-8%;
5) assembling the core plate prepared in the step 4) by using soybean glue, wherein the middle plate subjected to the medium temperature heat treatment in the step 3) is subjected to cold pressing at the unit pressure of 0.7 +/-0.2 MPa for 0.5-1 h, and hot pressing at the unit pressure of 0.6 +/-0.2 MPa at the temperature of 125 +/-5 ℃ for 18min after the cold pressing is finished to prepare a primary semi-finished product;
6) scraping greasiness on the primary semi-finished product prepared in the step 5) and preserving health;
7) performing glue distribution on the primary semi-finished product cured in the step 6), assembling a second layer of the middle plate subjected to the medium temperature heat treatment in the step 3), performing cold pressing at a unit pressure of 0.7 +/-0.2 MPa for 0.5-1 h, performing hot pressing at a unit pressure of 0.6 +/-0.2 MPa at a temperature of 125 +/-5 ℃ for 18min after the cold pressing is finished, and preparing a secondary semi-finished product;
8) and (6) pressing and pasting the facing.
2. The production process according to claim 1, wherein the veneer pressing process of the step 8) is a direct veneer pressing process, and specifically comprises the following steps: cold pressing the veneer layer of the secondary semi-finished product cloth and glue assembly density board prepared in the step 7) at a unit pressure of 0.65 +/-0.2 MPa for 0.5-1 h; hot pressing is carried out after cold pressing is finished, the unit pressure is 0.6 +/-0.2 MPa, the temperature is 125 +/-5 ℃, and the time is 360 seconds; the melamine impregnated bond paper is adopted for facing and pressing, the unit pressure is 0.7 +/-0.2 MPa, the temperature is 130 +/-8 ℃, and the time is 390 +/-60 s.
3. The production process according to claim 1, wherein the veneer pressing process of the step 8) is a composite veneer pressing process, and specifically comprises the following steps: laminating the density board veneer layer and the melamine impregnated bond paper into a combined veneer layer, wherein the unit pressure is 1.8 +/-0.2 MPa, the temperature is 200 ℃, and the time is 30 +/-5 s; and (5) compounding and pressing the semi-finished substrate produced in the step (7) and the combined decorative surface layer produced in the step (8) for 800 +/-60 s at the temperature of 85 +/-5 ℃ and the unit pressure of 0.5 +/-0.2 MPa.
4. The production process according to claim 1, wherein the core board layer is selected from fir or pine, and the thickness of the core board layer is 1.2-1.3 cm; the middle plate layer is made of eucalyptus and poplar, and the thickness of the middle plate layer is 2.6-3.0 mm.
5. The production process according to claim 1, wherein the balance layer is a technical wood veneer, a density board or a poplar veneer, and the thickness of the balance layer is 0.7-1.0 mm.
6. The process according to claim 1, wherein the finishing layer is preferably chosen among melamine-impregnated bond paper, PP film finishing or UV finishing.
7. The process according to claim 1, wherein the wood stabilizer MJB-TF is purchased from the company spearmint chemical company limited.
8. The thermal-modification deformation-resistant household door sheet manufactured according to the production process of any one of claims 1 to 7.
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